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Energetic electron acceleration by unsteady magnetic reconnection
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.ORCID iD: 0000-0003-1654-841x
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2013 (English)In: Nature Physics, ISSN 1745-2473, E-ISSN 1745-2481, Vol. 9, no 7, p. 426-430Article in journal (Refereed) Published
Abstract [en]

The mechanism that produces energetic electrons during magnetic reconnection is poorly understood. This is a fundamental process responsible for stellar flares(1,2),substorms(34), and disruptions in fusion experiments(5,6).Observations in the solar chromosphere(1) and the Earth's magnetosphere(7-10) indicate significant electron acceleration during reconnection, whereas in the solar wind, energetic electrons are absent(11). Here we show that energetic electron acceleration is caused by unsteady reconnection. In the Earth's magnetosphere and the solar chromosphere, reconnection is unsteady, so energetic electrons are produced; in the solar wind, reconnection is steady(12), so energetic electrons are absent(11). The acceleration mechanism is quasi-adiabatic: betatron and Fermi acceleration in outflow jets are two processes contributing to electron energization during unsteady reconnection. The localized betatron acceleration in the outflow is responsible for at least half of the energy gain for the peak observed fluxes.

Place, publisher, year, edition, pages
Nature Publishing Group, 2013. Vol. 9, no 7, p. 426-430
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Natural Sciences
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URN: urn:nbn:se:kth:diva-253250DOI: 10.1038/nphys2664ISI: 000321113200020Scopus ID: 2-s2.0-84880571526OAI: oai:DiVA.org:kth-253250DiVA, id: diva2:1324660
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QC 20190625

Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2019-06-25Bibliographically approved

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Khotyaintsev, Yuri V.Vaivads, AndrisAndré, Mats

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